only run selected texts in a user terminal

[elaihau]

• The selected texts are only run in a user terminal.
  If the terminal widget that has the focus

  1. is not a user terminal, or
  2. is a user terminal that has an actively running command,
     Theia should create a new user terminal and run the selected texts in that new terminal.

• fixes 'Run Selected Text' is not working when a task is stopped #7323

Signed-off-by: Liang Huang lhuang4@ualberta.ca

How to test

1. Start a task.
2. Highlight texts
3. Run highlighted texts by going to the top menu bar Terminal -> Run selected text
   Expected:

• The selected text should not simply be dumped into the terminal (where the task is running / ran) as a string
• The selected text should be run as a shell command in a user terminal
• If the visible terminal is not a user terminal, a new user terminal should be created to run the selected text as a shell command

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

[vince-fugnitto]

I verified the changes and they look good:

1. run selected text correctly spawns a new terminal (if none exist)
2. run selected text still works correctly after a task has been executed
3. a new terminal is created if the terminal with a task has focus

---

It might be out of scope of the pull-request, but one scenario I see will need some work or clarification:

1. execute run selected text (a new terminal is created)
2. open the problems-view (it has focus)
3. execute run selected text (the selected text is run in the first terminal but it is hidden by the problems-view)